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Concept

What Is Bit Depth?

Bit depth determines how many distinct colors or tones each pixel (or audio sample) can represent, directly affecting quality and file size.

Bit Depth explained

Bit depth (also called color depth for images or sample depth for audio) defines the number of bits used to represent each component of a pixel or audio sample. In images, an 8-bit-per-channel RGB image uses 24 bits per pixel (8 for red, 8 for green, 8 for blue), allowing 16.7 million colors. A 16-bit-per-channel image uses 48 bits per pixel, enabling 281 trillion color values — critical for smooth gradients and professional retouching. In audio, 16-bit provides the CD standard dynamic range of 96 dB, while 24-bit offers 144 dB for professional recording. Higher bit depth means more data, larger files, and more editing headroom, but the visual or auditory difference is often imperceptible in the final output.

Key points

8-bit per channel = 16.7 million colors (standard for web and consumer use)
16-bit per channel = 281 trillion colors (professional photography and print)
Higher bit depth provides more editing headroom for color correction and grading
Banding artifacts in gradients are a telltale sign of insufficient bit depth
In audio, 16-bit = CD quality (96 dB range), 24-bit = studio quality (144 dB range)
File size roughly doubles when moving from 8-bit to 16-bit per channel

Real-world examples

Shooting RAW at 14-bit to preserve shadow detail for later recovery in post-processing
Converting a 16-bit TIFF to an 8-bit JPG for web delivery while keeping the 16-bit master for print
Recording audio at 24-bit in the studio, then exporting at 16-bit for CD or streaming release

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Related terms

File Format
RAW

RAW files contain unprocessed sensor data from a digital camera, preserving maximum image quality and editing flexibility.

Concept
Color Space

A color space defines the specific range of colors (gamut) a device or file can represent, such as sRGB for screens or CMYK for print.

Technology
ICC Color Profile

An ICC color profile is a standardized data set that describes how a device (monitor, printer, camera) reproduces colors, ensuring consistent color across workflows.

File Format
TIFF

TIFF (Tagged Image File Format) is a flexible, high-quality image format used in publishing, photography, and archival for lossless image storage.